KR100939716B1 - Apparatus and method for controlling current of dryer - Google Patents

Abstract

The present invention relates to a current control device and method of a dryer that maintains a constant current consumption and minimizes electromagnetic noise regardless of voltage changes. A heater driver for selectively supplying a power waveform of the sampled section to the heater, a motor driver for supplying power supplied to the motor according to a control signal, a voltage detector for sensing a power voltage output from the power source, and And a control unit for outputting a control signal to the motor driving unit according to the operation command and outputting the control signal to the heater driving unit according to the motor applied current so that the total current consumption is kept constant according to the output variation of the voltage sensing unit. Can be blocked, and the stability and reliability of the product can be improved. .

Heater / Consumption Current

Description

Apparatus and method for controlling current of dryer}

1 is a longitudinal cross-sectional view showing the configuration of a typical dryer.

2 is a cross-sectional view taken along the line I-I of FIG.

Figure 3 is a graph showing the current change according to the input voltage of the dryer according to the prior art

Figure 4 is a block diagram showing the configuration of the current control device of the dryer according to the present invention

5 is a graph showing a change in current according to the input voltage of the dryer according to the present invention

The present invention relates to a dryer, and more particularly, to an apparatus and method for controlling a current of a dryer.

Generally, the clothes dryer includes a main body 100 having an inlet 101 formed at a front surface thereof, and a drying drum 30 rotatably installed in the main body 100 and having a plurality of stirring pieces 30a protruding from an inner circumferential surface thereof. And, the door 105 for selectively opening and closing the inlet 101, the motor 50 is fixed to the inside of the main body 100 to generate a rotational force, and the rotational force generated from the motor 50 drying drum ( 30 and a hot air guide flow path 10a and 10b for guiding the air flow to discharge the outside air into the drying drum 30 to be discharged to the outside of the main body 100, and the hot air guide flow path 30. (10a) is installed inside the heater 20 for heating the air to a high temperature state, and the forced air flow to generate the external air through the hot air guide flow path (10a) to be discharged to the outside of the main body (100) The exhaust fan 40 is comprised.

Referring to the drying operation according to the clothes dryer made in this configuration as follows.

First, after the drying object is put into the drying drum 30, the drying operation is performed, and the heater 20 and the motor 50 are operated.

Then, as the exhaust fan 40 is operated, hot air generated by the high temperature of the external air introduced into the main body 100 through the suction side of the hot air guide passage 10a and passing through the heater 20 is hot air guide passage ( It is forced into the drying drum 30 through 10a).

Subsequently, the hot air introduced into the drying drum 30 is discharged to the outside of the main body 100 through the discharge side of the hot air guide flow path 10b while evaporating the moisture of the dry object in the wet state by the suction blowing force of the exhaust fan 40. The discharge cycle is repeated, wherein the drying drum 30 receives the driving force of the motor 50 by the belt 60 and rotates at a low speed in the forward and reverse directions for a predetermined time so that the drying object therein is stirred. It is pulled up and dropped by 30a, and the drying object is dried in this process.

That is, the hot air supplied into the drying drum 30 as the drying object 30 is solved by releasing the kink or entanglement of the inner drying object by the rotation of the drying drum 30 and continuously flowing the drying object inside the drying drum 30. It is to be evenly delivered to the drying object to improve the drying performance.

The above-described clothes dryer increases the motor and heater output through the phase control power supply while performing the input voltage sensing as shown in FIG. 3, and maintains the output of the heater at a constant level when the detected input voltage exceeds the rated voltage. Let's do it.

Thus, the output of the heater remains constant, but the motor output increases, so that the total current consumption increases and the circuit breaker operates due to the rapid current increase.

The dryer according to the related art has a problem in that the output of the heater is kept constant, but the motor output increases, so that the total current consumption increases and a circuit breaker operates due to a sudden current increase.

In addition, since the power is supplied by the phase control method, the on / off timing of the power supply is not synchronized with the zero cross, resulting in inrush current, which may cause malfunction due to electromagnetic noise.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and provides a current control apparatus and method for a dryer in which the total current consumption is kept constant regardless of voltage changes and the occurrence of electromagnetic noise is minimized. There is a purpose.

The current control apparatus of the dryer according to the present invention includes a heater driving unit for sampling power supplied through the power supply unit in a predetermined section according to a control signal and selectively supplying a power waveform of the sampled section to the heater, and a power supply unit according to the control signal. A motor driver for supplying power supplied to the motor, a voltage detector for detecting a power voltage output from the power supply unit, a control signal to the motor driver according to an operation command, and a total current consumption according to the output variation of the voltage detector. It characterized in that it comprises a control unit for outputting a control signal to the heater driving unit in accordance with the motor applied current so that the constant.

In the dryer's current control method according to the present invention, if a drying command is input, increasing the outputs of the heater and the motor until the power supply voltage reaches a predetermined level; And controlling the output of the heater with reference to the motor output and the predetermined heater output table to be maintained.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the current control device and method of the dryer according to the present invention will be described in detail.

Figure 4 is a block diagram showing the configuration of the current control device of the dryer according to the present invention, Figure 5 is a graph showing the current change according to the input voltage of the dryer according to the present invention.

As shown in FIG. 4, in the dryer's current control device according to the present invention, a predetermined section of the entire AC current waveform is sampled and sampled according to control signals of the power supply unit 260, the heater 220, and the control unit 200. The motor driver for supplying the power of the power source unit 260 to the motor 250 in accordance with the control signal of the heater driver 210, the motor 250, the control unit 200 to selectively supply the power waveform of the heater 220 240, a voltage detector 230 for detecting a power voltage output from the power supply unit 260, and outputs a control signal to the motor driver 240 according to an operation command and outputs the voltage detection unit 230. And a controller 200 for outputting a control signal to the heater driving unit 210 according to the motor applied current so that the total current consumption is kept constant according to the variation.

In addition, a circuit breaker (not shown) is connected to the power supply terminals of the heater 220 and the motor 250 to cut off the power supply to prevent damage to each component when the current consumption exceeds the set value.

Referring to the control method of the current control device of the dryer according to the present invention configured as described above are as follows.

First, the controller 200 recognizes the user's input of the dryer operation command and outputs a control signal to the heater driver 210 and the motor driver 240 so that the heater 220 and the motor 250 are driven.

At this time, the control unit 200 checks the output voltage variation of the power supply unit 260 through the voltage sensing unit 230.

Therefore, the heater 220 is driven and heated air is introduced into the drying drum and circulated by the driving of the motor 250.

Subsequently, the control unit 200 according to the output voltage of the power supply unit 260 through the voltage sensing unit 230 reaches a constant voltage level, for example, a rated voltage or a sudden change, as shown in FIG. While the output of the motor 250 continues to increase while being maintained, the output of the heater 220 is reduced in proportion to it.

Output (Watt) Cycle One 2 … 14 15 16 17 … 29 30 0 0 0 … 0 0 0 0 … 0 0 100 One 0 … 0 0 0 0 … 0 0 200 One 0 … 0 0 One 0 … 0 0 1500 One 0 … 0 One 0 One … One 0 1600 One 0 … 0 One 0 One … One One 2900 One One … One One One One … One 0 3000 (max) One One … One One One One … One One

In addition, the heater 220 output control is basically made by reducing the heater output to be proportional to the increase in the motor output, the control unit 200 controls the heater driving unit 210 with reference to the pre-stored heater output table heater 220 To control the output.

At this time, the heater output table samples AC power by a predetermined section, and divides the power waveform of each 360 ° period for each sampling section into one cycle, and the power supply to the heater among all cycles is selected cycles. The selected cycle is then set to be uniformly distributed throughout the cycle.

Table 1 shows an example of the heater output table. The heater 220 outputs up to 3000 Watts (Watt: W) and samples 30 cycles of AC power (each cycle is 360 ° of the power waveform). The output per control step is assumed to be 100W.

Therefore, if the output of the heater 220 is controlled to 100W, since the output per one control step is 100W and one cycle corresponds to one step, the heater 220 only during the first cycle of the 30 cycles in each sampling section. Ensure power is supplied to Of course, if the output of the heater 220 is not changed, the same power supply is repeated in the continuous sampling section.

As another example, if the output of the heater 220 is controlled to 200W, 200W corresponds to 2 steps and 2 steps corresponds to 2 cycles, so the heater (only for the first cycle and the 16th cycle of the 30 cycles for each sampling interval is included). 220 is supplied with power. In other words, the cycle selected to supply power is uniformly distributed over the entire cycle without biasing either side.

As another example, if the output of the heater 220 is controlled to 1500W, 1500W corresponds to 15 steps, which corresponds to 15 cycles, so that power is supplied to the heater 220 alternately from the first cycle to the last cycle of 30 cycles. do.

When the output of the heater 220 is controlled to 3000W, the same method is used. Therefore, the power may be supplied for the entire cycle. If the control is performed at 2900W, the power may not be supplied only for the last cycle of the 30 cycles.

In the case of other outputs, the heater 220 power supply is controlled by the above-described method.

The heater 220 power control method described above is to supply power evenly without biasing one of the cycles of one sampling section. In addition to the above-described example, the heater 220 power supply control method may be prepared to match the sampling section and the output step.

In addition, since the power supply is turned on and off in synchronization with the zero cross in each cycle, that is, when the current becomes almost '0', inrush current does not occur, thereby minimizing the generation of electromagnetic noise.

The current control apparatus and method of the dryer according to the present invention maintains a constant current consumption through heater output control even when an input voltage fluctuates, thereby preventing unnecessary circuit breakers, and controlling power in cycle units, that is, power source. Since the waveform is made in units of 360 ° cycles, it can be synchronized with zero cross to prevent inrush current, thereby minimizing electromagnetic noise, thereby improving product stability and reliability.

Claims (6)

A dryer having a heater for heating air, and a fan motor and a power supply unit for circulating air heated by the heater, A heater driver for sampling power supplied through the power supply unit in a predetermined section according to a control signal and selectively supplying a power waveform of the sampled section to the heater; A motor driver supplying power supplied through the power supply unit to the motor according to a control signal; A voltage detector configured to detect a power supply voltage output from the power supply unit; A control unit outputting a control signal to the motor driving unit according to an operation command and outputting a control signal to the heater driving unit according to the motor applied current so that the total current consumption is kept constant according to the output variation of the voltage sensing unit. Current controller. In the current control method of a dryer having a heater, a motor and a control means, Increasing the output of the heater and the motor until the power supply voltage reaches a predetermined level when a drying command is input; And controlling the output of the heater with reference to a motor output and a predetermined heater output table such that when the power supply voltage becomes higher than a predetermined level, the total current consumption is kept constant. The method of claim 2, Adjusting the output of the heater is a current control method of the dryer, characterized in that for reducing the output of the heater. The method of claim 2, The heater output table is characterized in that the AC power is sampled by a predetermined section unit, and the power waveform of each 360 ° period for each sampling section is divided into one cycle, and the power supply to the heater is selected among the entire cycles for each heater output step. Drying current control method. The method of claim 4, wherein And wherein the selected cycle is set uniformly over the entire cycle. The method of claim 4, wherein And the selected cycle section is supplied with power in synchronization with a zero cross time point.

Images